AL250 International Power Sources, Inc., AL250 Datasheet - Page 9

• Manufacturer Part Number: AL250
• Description: Video Scan Doubler
• Manufacturer: International Power Sources, Inc.

To select YUV422 or RGB565 as the output format, program the Control Register #08h<7>, i.e.,
OutFormat.
6.2 Default Resolution
The resolution of the AL250/251 applications depends on the input video source, e.g., the digital
video decoder. The typical resolution of the video decoder that the AL250/251 supports without
software, and the VCLK frequency provided by the decoder to the AL250/251 is as follows:
The AL250/251 can process up to 768 active pixels per line and 1024 lines per frame.
6.3 Video Timing
The AL250/251 registers 20h~29h and 2Bh~2Eh are used to control the video timing. All increments
are either by 8 pixels per line or by 4 lines per frame. All values (times 8 or 4) are relative to the
input video source H-sync or V-sync. These registers need to be programmed if the input video
resolution is different from the default resolution supported.
VCLKx2 (MHz)
VCLK (MHz)
OutFormat
Pixel Active
Pixel Total
DO
DO
DO
DO
DO
DO
DO
DO
DO
DO
DO
DO
DO
15
14
13
12
11
10
4
3
2
1
0
9
8
select
24.545454
12.272727
780 x 525
640 x 480
NTSC
Square Pixel
51
50
49
48
47
66
65
64
63
26
25
24
23
-
944 x 625
768 x 576
14.75
PAL
29.5
U7, V7
U6, V6
U5, V5
U4, V4
U3, V3
U2, V2
U1, V1
U0, V0
Y4
Y3
Y2
Y1
Y0
1
858 x 525
720 x 480
NTSC
13.5
27
CCIR 601
R4
R3
G7
G6
G5
G4
G3
G2
B7
B6
B5
B4
B3
0
864 x 625
720 x 576
PAL
13.5
27
July 28, 1999
AL250
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